EP0199026A2 - Measuring table for a coordinate measurement system - Google Patents

Measuring table for a coordinate measurement system Download PDF

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Publication number
EP0199026A2
EP0199026A2 EP86102598A EP86102598A EP0199026A2 EP 0199026 A2 EP0199026 A2 EP 0199026A2 EP 86102598 A EP86102598 A EP 86102598A EP 86102598 A EP86102598 A EP 86102598A EP 0199026 A2 EP0199026 A2 EP 0199026A2
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EP
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Prior art keywords
grid conductors
measuring table
measuring
grid
conductors
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Granted
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EP86102598A
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German (de)
French (fr)
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EP0199026B1 (en
EP0199026A3 (en
Inventor
Wolfgang Jacob-Grinschgl
Udo Müller
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Kontron Elektronik GmbH
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Kontron Holding AG
Kontron Elektronik GmbH
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires

Definitions

  • the invention relates to a measuring table for a coordinate measuring device for determining the position of an inductive measuring sensor, with a plurality of parallel grid lines for each coordinate, which can be activated one after the other.
  • the grid conductors are activated individually one after the other, i.e. flowed through by current or connected to an evaluation circuit, and the measurement signal is fed to an evaluation circuit which, among other things. performs a two-time differentiation of the measurement signal.
  • the invention has for its object to provide a measuring table of the type mentioned, which enables the use of a simplified evaluation circuit.
  • At least two closely adjacent grid conductors are preferably connected to one another in the manner of a winding.
  • the connected grid conductors can each form a coil with a plurality of turns, so that when the grid conductors are used as transmitters, a lower current is required to achieve a specific magnetic flux, or when the grid conductors are used as receivers, a higher induction voltage occurs.
  • the coils each have an equal number of winding regions running transversely to the assigned coordinate direction.
  • the coil-like structures formed from the series-connected grid conductors are arranged to overlap one another. This enables greater measurement accuracy to be achieved.
  • a particularly favorable embodiment for realizing the overlapping arrangement can be seen in the fact that the grid conductors are applied as printed conductor tracks on a thin foil and that several such foils are stacked one above the other.
  • Fig. 1 serves to explain the operation of the measuring table.
  • 1 shows two grid conductors 1 and 2, which are connected in series in opposite directions by a conductor piece 3 running transversely thereto. If a current source is connected to the connections 4 and 5 of the grid conductor structure 1, 2, 3, then the grid conductor 1 generates a magnetic flux in a specific direction in an inductive measuring sensor 6 designed as a coil, while the grid conductor 2 generates a magnetic flux in this direction due to the opposite direction of current generated in the opposite direction.
  • these two magnetic fluxes do not cancel each other out because the grid conductors 1 and 2 are at a distance a from one another, so that the grid conductor 2 is closer to the measuring sensor 6 and generates a stronger magnetic flux.
  • FIG. 2 shows three pairs 7, 8 and 9 lying next to one another, each of two grid conductors connected in series. In fact, depending on the size of a measuring tablet, several tens to a hundred grid conductors are provided for each coordinate direction in order to achieve sufficient measuring accuracy.
  • the accuracy of the differentiation essentially depends on the distance a between the interconnected pairs of grid conductors.
  • FIG. 3 shows another arrangement of the grid conductors, which form a single, meandering conductor track 10, which have connections 12, 13, 14, 15 and 16 on the short conductor sections 11 connecting the actual grid conductors.
  • the connections 12 and 14, 15 and 13, 14 and 16 etc. are successively connected to the first or second pole of a current source. It can be seen that current flows through two grid conductors in opposite directions.
  • FIG. 4 shows a further embodiment of a measuring table, in which the two grid conductors that belong together are expanded to form coils 17, 18. It is thereby achieved that a lower current through the grid conductors is required to generate a specific magnetic flux, so that the control circuits can be implemented more cost-effectively.
  • FIG. 5 schematically shows a preferred embodiment of a measuring table, in which six coils, each with one turn, are arranged to overlap one another.
  • the coils 24, 25 and 26 are in a first plane, while the coils 27, 28 and 29 are in a separate plane.
  • Such an arrangement of the coils can be realized by the coils 24, 25 and 26 being applied as conductor tracks on a film and the coils 27, 28 and 29 as conductor tracks on a separate film, the two films being then placed one above the other in such a way that the Coils 27, 28 and 29 are offset from coils 24, 25 and 26.
  • the coils are activated in the order 24,27,25,28,26,29.
  • the invention can be used not only in the event that current flows through the grid conductors and a measurement signal is generated in the sensor 6, but also in the reverse case when a current flows through the sensor and the respectively connected pairs of grid conductors can be connected in succession to an evaluation circuit. In this case, however, it is necessary to send a changing current through the sensor, for example an alternating current, the frequency of which is higher than the switching frequency of the grid conductors.
  • the invention can also be used together with the applicant's simultaneously filed invention entitled “Coordinate Measuring Device”, which in turn has a single differentiating effect and which, in combination with the invention described above, results in a double differentiation.

Abstract

Bei einem Meßtisch für eine Koordinatenmeßvorrichtung zum Bestimmen der Position eines induktiven Meßaufnehmers werden jeweils zwei benachbarte Gitterleiter gegensinnig von Strom durchflossen, so daß nur die Differenz der Magnetfelder der einzelnen Gitterleiter auf den Meßaufnehmer wirkt. Dadurch entsteht in dem Meßaufnehmer ein einfach differenziertes Meßsignal.In a measuring table for a coordinate measuring device for determining the position of an inductive measuring sensor, two adjacent grid conductors are flowed through in opposite directions, so that only the difference in the magnetic fields of the individual grid conductors acts on the measuring sensor. This creates a simply differentiated measurement signal in the sensor.

Description

Die Erfindung betrifft einen Meßtisch für eine Koordinatenmeßvorrichtung zum Bestimmen der Position eines induktiven Meßaufnehmers, mit mehreren parallelen Gitterleitungen für jede Koordinate, die nacheinander aktivierbar sind.The invention relates to a measuring table for a coordinate measuring device for determining the position of an inductive measuring sensor, with a plurality of parallel grid lines for each coordinate, which can be activated one after the other.

Bei einem bekannten derartigen Meßtisch, auch Digitizer genannt, werden die Gitterleiter einzeln nacheinander aktiviert, d.h. von Strom durchflossen oder an eine Auswerteschaltung angeschaltet, und das Meßsignal wird einer Auswerteschaltung zugeführt, die u.a. eine zweimalige Differentiation des Meßsignals vornimmt.In a known measuring table of this type, also called a digitizer, the grid conductors are activated individually one after the other, i.e. flowed through by current or connected to an evaluation circuit, and the measurement signal is fed to an evaluation circuit which, among other things. performs a two-time differentiation of the measurement signal.

Der Erfindung liegt die Aufgabe zugrunde, einen Meßtisch der eingangs genannten Art zu - schaffen, der die Verwendung einer vereinfachten Auswerteschaltung ermöglicht.The invention has for its object to provide a measuring table of the type mentioned, which enables the use of a simplified evaluation circuit.

Die Lösung dieser Aufgabe ist darin zu sehen, daß jeweils mindestens zwei Gitterleiter gegensinnig geschaltet aktiviert werden. Dadurch wird eine Differenzbildung der magnetischen Wirkung des Stromflusses durch die jeweils aktivierten Gitterleiter auf den induktiven Meßaufnehmer erreicht bzw., wenn der Meßaufnehmer als Sender und die Gitterleiter als Empfänger dienen, eine Differenzbildung der durch die unterschiedlichen magnetischen Feldstärker an den aktivierten Gitterleitern erzeugten Induktionsspannungen. Bei genügend geringem Abstand der in Serie geschalteten Gitterleiter und bei aufeinanderfolgender Aktivierung der aus jeweils mindestens zwei Gitterleitem bestehenden spulenartigen Gebilde wird ein Meßsignal erzeugt, welches gegenüber den mit bekannten Meßtischen erzeugten Meßsignalen bereits einfach differenziert ist. Die Auswerteschaltung braucht daher lediglich noch so bemessen zu sein, daß sie das Meßsignal lediglich noch einmal differenziert.The solution to this problem can be seen in the fact that at least two grid conductors are activated switched in opposite directions. This creates a difference in the magnetic effect of the current flow through the respectively activated grid conductors on the inductive sensor or, if the sensor serves as a transmitter and the grid conductors as receivers, a difference in the induction voltages generated by the different magnetic field strengths on the activated grid conductors. With a sufficiently small distance between the series connected grid conductors and with successive activation of the coil-like structures, each consisting of at least two grid conductors, a measurement signal is generated which is already simply differentiated from the measurement signals generated with known measuring tables. The evaluation circuit therefore only needs to be dimensioned such that it differentiates the measurement signal only once more.

Vorzugsweise sind jeweils mindestens zwei eng benachbarte Gitterleiter windungsartig miteinander verbunden.At least two closely adjacent grid conductors are preferably connected to one another in the manner of a winding.

Dabei können die verbundenen Gitterleiter jeweils eine Spule mit mehreren Windungen bilden, so daß bei Verwendung der Gitterleiter als Sender eine geringere Stromstärke zur Erzielung eines bestimmten Magnetflusses erforderlich ist bzw. bei Verwendung der Gitterleiter als Empfänger eine höhere Induktionsspannung auftritt.The connected grid conductors can each form a coil with a plurality of turns, so that when the grid conductors are used as transmitters, a lower current is required to achieve a specific magnetic flux, or when the grid conductors are used as receivers, a higher induction voltage occurs.

Vorzusgweise weisen dabei die Spulen jeweils eine gleiche Anzahl von quer zu der zugeordneten Koordinatenrichtung verlaufende Windungsbereiche auf.In this case, the coils each have an equal number of winding regions running transversely to the assigned coordinate direction.

Gemäß einer vorteilhaften Weiterbildung sind die aus den in Serie geschalteten Gitterleitem gebildeten spulenartigen Gebilde einander überlappend angeordnet. Dadurch läßt sich eine größere Meßgenauigkeit erzielen.According to an advantageous development, the coil-like structures formed from the series-connected grid conductors are arranged to overlap one another. This enables greater measurement accuracy to be achieved.

Eine besonders günstige Ausführungsform zur Realisierung der überlappenden Anordnung ist darin zu sehen, daß die Gitterleiter als gedruckte Leitungsbahnen auf einer dünnen Folie aufgebracht sind und daß mehrere derartige Folien versetzt übereinander gestapelt sind.A particularly favorable embodiment for realizing the overlapping arrangement can be seen in the fact that the grid conductors are applied as printed conductor tracks on a thin foil and that several such foils are stacked one above the other.

Die Erfindung ist im folgenden anhand - schematischer Zeichnungen an mehreren Ausführungsbeispielen ergänzend beschrieben.

  • Fig. 1 zeigt die Wirkungsweise des Meßtisches;
  • Fig. 2 zeigt eine Anordnung der Gitterleiter auf einem Meßtisch, bei dem jeweils zwei benachbarte Gitterleiter haamadelförmig miteinander verbunden sind;
  • Fig. 3 zeigt eine meanderförmige Gestalt der Gitterleiter;
  • Fig. 4 zeigt eine gegenüber Fig. 2 abgeänderte Ausführungsform, und
  • Fig. 5 zeigt in Serie geschaltete Gitterleiterpaare in überlappender Anordnung.
The invention is described below with reference to - schematic drawings of several embodiments.
  • Fig. 1 shows the operation of the measuring table;
  • 2 shows an arrangement of the grid conductors on a measuring table, in which two adjacent grid conductors are connected to one another in a hairpin shape;
  • Fig. 3 shows a meandering shape of the grid conductor;
  • FIG. 4 shows an embodiment modified from FIG. 2, and
  • 5 shows pairs of grid conductors connected in series in an overlapping arrangement.

Fig. 1 dient zur Erläuterung der Wirkungsweise des Meßtisches. Man erkennt in Fig. 1 zwei Gitterleiter 1 und 2, die durch ein quer dazu verlaufendes Leiterstück 3 gegensinnig in Serie geschaltet sind. Wenn an die Anschlüsse 4 und 5 des Gitterleitergebildes 1, 2, 3 eine Stromquelle angeschlossen wird, dann erzeugt der Gitterieiter 1 in einem als Spule ausgebildeten induktiven Meßaufnehmer 6 einen Magnetfluß einer bestimmten Richtung, während der Gitterleiter 2 aufgrund der gegensinnigen Stromrichtung in diesem einen Magnetfluß mit umgekehrter Richtung erzeugt. Diese beiden Magnetflüsse heben sich jedoch nicht auf, da die Gitterleiter 1 und 2 einen Abstand a voneinander haben, so daß also der Gitterleiter 2 näher an dem Meßaufnehmer 6 liegt und einen stärkeren Magnetfluß erzeugt.Fig. 1 serves to explain the operation of the measuring table. 1 shows two grid conductors 1 and 2, which are connected in series in opposite directions by a conductor piece 3 running transversely thereto. If a current source is connected to the connections 4 and 5 of the grid conductor structure 1, 2, 3, then the grid conductor 1 generates a magnetic flux in a specific direction in an inductive measuring sensor 6 designed as a coil, while the grid conductor 2 generates a magnetic flux in this direction due to the opposite direction of current generated in the opposite direction. However, these two magnetic fluxes do not cancel each other out because the grid conductors 1 and 2 are at a distance a from one another, so that the grid conductor 2 is closer to the measuring sensor 6 and generates a stronger magnetic flux.

Fig. 2 zeigt drei nebeneinander liegende Paare 7, 8 und 9 von jeweils zwei in Serie geschalteten Gitterleitern. Tatsächlich sind auf einem Meßtablett je nach dessen Größe einige zehn bis hundert Gitterleiter für jede Koordinatenrichtung vorgesehen, um eine genügende Meßgenauigkeit zu erzielen.2 shows three pairs 7, 8 and 9 lying next to one another, each of two grid conductors connected in series. In fact, depending on the size of a measuring tablet, several tens to a hundred grid conductors are provided for each coordinate direction in order to achieve sufficient measuring accuracy.

Bei aufeinanderfolgender Erregung der Gitterleiterpaare 7, 8 und 9 entsteht in dem Meßaufnehmer eine Meßspannung, die der ersten Ableitung einer Meßsignalspannung entspricht, wie sie entstehen würde, wenn die benachbart liegenden Gitterleiter jedes Paares 7, 8, 9 nicht miteinander verbunden wären, sondern die Gitterleiter 1, 2 einzeln und aufeinanderfolgend von einem gleichen Strom durchflossen werden würden, wie bei bekannten Meßtischen. Dadurch, daß jeweils zwei benachbarte Gitterleiter gegensinnig von Strom durchflossen werden, entsteht also eine differenzierende Wirkung.With successive excitation of the pairs of grid conductors 7, 8 and 9, a measurement voltage is generated in the sensor which corresponds to the first derivative of a measurement signal voltage as would arise if the adjacent grid conductors of each pair 7, 8, 9 were not connected to one another, but rather the grid conductors 1, 2 would be flowed through individually and successively by the same current as in known measuring tables. The fact that current flows through two adjacent grid conductors in opposite directions creates a differentiating effect.

Die Genauigkeit der Differentiation hängt dabei im wesentlichen von dem Abstand a der zusammengeschalteten Paare von Gitterleitern ab.The accuracy of the differentiation essentially depends on the distance a between the interconnected pairs of grid conductors.

Fig. 3 zeigt eine andere Anordnung der Gitterleiter, die eine einzige, meanderförmige Leiterbahn 10 bilden, welche an den die eigentlichen Gitterleiter verbindenden kurzen Leiterabschnitten 11 Anschlüsse 12, 13, 14, 15 und 16 aufweisen. Beim Betrieb der Meßvorrichtung werden nacheinander die Anschlüsse 12 und 14, 15 und 13, 14 und 16 usw. an den ersten bzw. zweiten Pol einer Stromquelle angeschaltet. Man erkennt, daß dadurch jeweils zwei Gitterleiter gegensinnig von Strom durchflossen werden.FIG. 3 shows another arrangement of the grid conductors, which form a single, meandering conductor track 10, which have connections 12, 13, 14, 15 and 16 on the short conductor sections 11 connecting the actual grid conductors. When the measuring device is in operation, the connections 12 and 14, 15 and 13, 14 and 16 etc. are successively connected to the first or second pole of a current source. It can be seen that current flows through two grid conductors in opposite directions.

Fig. 4 zeigt eine weitere Ausführungsform eines Meßtisches, bei der die jeweils zusammengehörenden zwei Gitterleiter zu Spulen 17,18 erweitert sind. Dadurch wird erreicht, daß zum Erzeugen eines bestimmten Magnetflusses ein geringerer Strom durch die Gitterleiter erforderlich ist, so daß die Ansteuerschaltungen kostengünstiger realisiert werden können.FIG. 4 shows a further embodiment of a measuring table, in which the two grid conductors that belong together are expanded to form coils 17, 18. It is thereby achieved that a lower current through the grid conductors is required to generate a specific magnetic flux, so that the control circuits can be implemented more cost-effectively.

Fig. 5 zeigt schematisch eine bevorzugte Ausführungsform eines Meßtisches, bei der sechs Spulen mit jeweils einer Windung einander überlappend angeordnet sind. Die Spulen 24,25 und 26 liegen dabei in einer ersten Ebene, während die Spulen 27 28 und 29 in einer davon getrennten Ebene liegen. Eine derartige Anordnung der Spulen läßt sich realisieren, indem die Spulen 24,25 und 26 als Leiterbahnen auf einer Folie aufgebracht sind und die Spulen 27,28 und 29 als Leiterbahnen auf einer getrennten Folie, wobei beide Folien sodann übereinander gelegt sind derart, daß die Spulen 27,28 und 29 versetzt zu den Spulen 24,25 und 26 liegen. Die Aktivierung der Spulen geschieht in der Reihenfolge 24,27,25,28,26,29.5 schematically shows a preferred embodiment of a measuring table, in which six coils, each with one turn, are arranged to overlap one another. The coils 24, 25 and 26 are in a first plane, while the coils 27, 28 and 29 are in a separate plane. Such an arrangement of the coils can be realized by the coils 24, 25 and 26 being applied as conductor tracks on a film and the coils 27, 28 and 29 as conductor tracks on a separate film, the two films being then placed one above the other in such a way that the Coils 27, 28 and 29 are offset from coils 24, 25 and 26. The coils are activated in the order 24,27,25,28,26,29.

Die Erfindung läßt sich nicht nur anwenden für den Fall, daß die Gitterleiter von Strom durchflossen sind und in dem Meßaufnehmer 6 ein Meßsignal erzeugt wird, sondern auch für den umgekehrten Fall, daß der Meßaufnehmer von einem Strom durchflossen wird und die jeweils zusammengeschalteten Paare von Gitterleitern nacheinander an eine Auswerteschaltung angeschlossen werden. In diesem Fall ist es jedoch erforderlich, einen sich ändernden Strom durch den Meßaufnehmer zu schicken, beispielsweise einen Wechselstrom, dessen Frequenz höher ist als die Umschaltfrequenz der Gitterleiter.The invention can be used not only in the event that current flows through the grid conductors and a measurement signal is generated in the sensor 6, but also in the reverse case when a current flows through the sensor and the respectively connected pairs of grid conductors can be connected in succession to an evaluation circuit. In this case, however, it is necessary to send a changing current through the sensor, for example an alternating current, the frequency of which is higher than the switching frequency of the grid conductors.

Die Erfindung läßt sich auch anwenden zusammen mit der gleichzeitig eingereichten Erfindung des Anmelders mit dem Titel "Koordinatenmeßvorrichtung", die ihrerseits eine einfach differenzierende Wirkung hat und die in Kombination mit der oben beschriebenen Erfindung eine zweifache Differentiation ergibt.The invention can also be used together with the applicant's simultaneously filed invention entitled "Coordinate Measuring Device", which in turn has a single differentiating effect and which, in combination with the invention described above, results in a double differentiation.

Claims (6)

1. Meßtisch für eine Koordinatenmeßvorrichtung zum Bestimmen der Position eines induktiven Meßaufnehmers, mit mehreren parallelen Gitterleitern für jede Koordinate, die nacheinander aktivierbar sind, dadurch gekennzeichnet, daß jeweils mindestens zwei Gitterleiter gegensinnig geschaltet aktiviert werden.1. Measuring table for a coordinate measuring device for determining the position of an inductive sensor, with a plurality of parallel grid conductors for each coordinate, which can be activated one after the other, characterized in that at least two grid conductors are activated in opposite directions. 2. Meßtisch nach Anspruch 1, dadurch gekennzeichnet, daß jeweils mindestens zwei eng benachbarte Gitterleiter windungsartig miteinander verbunden sind.2. Measuring table according to claim 1, characterized in that in each case at least two closely adjacent grid conductors are connected to each other like a winding. 3. Meßtisch nach Anspruch 2, dadurch gekennzeichnet, daß die verbundenen Gitterleiter jeweils eine Spule mit mehreren Windungen bilden.3. Measuring table according to claim 2, characterized in that the connected grid conductors each form a coil with several turns. 4. Meßtisch nach Anspruch 3, dadurch gekennzeichnet, daß die Spulen jeweils eine gleiche Anzahl von quer zu der zugeordneten Koordinatenrichtung verlaufenden Windungsbereichen aufweisen.4. Measuring table according to claim 3, characterized in that the coils each have an equal number of winding regions running transversely to the assigned coordinate direction. 5. Meßtisch nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die aus den in Serie geschalteten Gitterleitern gebildeten spulenartigen Gebilde einander überlappend angeordnet sind.5. Measuring table according to claim 1 to 4, characterized in that the coil-like structures formed from the series-connected grid conductors are arranged to overlap one another. 6. Meßtisch nach Anspruch 1 bis 4 und 5, dadurch gekennzeichnet, daß die Gitterleiter als gedruckte Leitungsbahnen auf einer dünnen Folie aufgebracht sind und daß mehrere derartige Folien versetzt übereinander gestapelt sind.6. Measuring table according to claim 1 to 4 and 5, characterized in that the grid conductors are applied as printed conductor tracks on a thin film and that several such films are stacked one above the other.
EP86102598A 1985-04-01 1986-02-28 Measuring table for a coordinate measurement system Expired - Lifetime EP0199026B1 (en)

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Application Number Priority Date Filing Date Title
DE19853511863 DE3511863A1 (en) 1985-04-01 1985-04-01 MEASURING TABLE FOR A COORDINATE MEASURING DEVICE
DE3511863 1985-04-01

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EP0199026A2 true EP0199026A2 (en) 1986-10-29
EP0199026A3 EP0199026A3 (en) 1988-09-07
EP0199026B1 EP0199026B1 (en) 1991-05-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005395A1 (en) * 1989-05-29 1990-12-13 Kontron Elektronik POSITION MEASURING DEVICE

Also Published As

Publication number Publication date
DE3511863A1 (en) 1986-10-09
JPS61259101A (en) 1986-11-17
US4855538A (en) 1989-08-08
DE3679439D1 (en) 1991-07-04
EP0199026B1 (en) 1991-05-29
JPH0519166B2 (en) 1993-03-16
EP0199026A3 (en) 1988-09-07

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